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To let this 331ci small-block breathe, we called up Trick Flow Specialties and ordered a set of its brand-new Fast as Cast 190cc Twisted Wedge cylinder heads. Part number TFS-51400015 nets you aluminum Twisted Wedge heads that feature 2.020-inch intake valves and 1.60-inch exhaust valves. Trick Flow used its CNC-ported 185cc runner port design and cast it into a new head. That way you get the flow of the ported head at a cast price. The 190cc heads utilize a 7/16-inch rocker stud size, as well as 5/16-inch pushrods.